Artificial silk ring doubler



Nov. 21, 1933.

c. SCHLEIFER 1,936,370 ARTIFICIAL SILK RING DOUBLER Filed Sept. 9, 1932 eNT'oK BY: mm M Patented Nov. 21, 1933.

i 1,936,370 ARTIFICIAL SILK RING DOUBLER Carlo Schleifer, Novara, Italy, assignor to Societa Anonima Officina Meccanica St. Andrea- Novara, Novara, Italy, a society of Italy Application September 9, 1932, Serial No. 632,453, and in Italy September 11, 1931 3 Claims. (Cl. 1172) It is known that the usual continuous ring doublers are not suitable for various reasons for giving the first twist to fibres of artificial silk leaving the first spinning cop.

It is known in fact that this first twist comprises in general a small number of turns per metre thus producing avery high rate of feed with respect to the number of turns of the spindles.

It is therefore necessary for the movement to be transmitted from the tin rollers to the delivery rollers at a very high speed.

Now in the usual doubling frames the drive is transmitted at a reduced speed from the main tin roller shaft to the delivery members exclusively by cylindrical gearing contained in the head-stock of the machine and partly mountedupon fixed pivots and partly upon adjustable pivots for the purpose of permitting certain gears to be changed with a view to altering the transmission ratio.

Naturally .these gears have a limiting peripheral speed which it is impossible or inconvenient to exceed. If it is desired to adapt a normal doubling frame inorder to obtain the low twist required for artificial silk, it would be necessary to exceed the above mentioned limiting peripheral speed of the gear at the risk of spoiling the work, or else it-would be necessary to reduce the speed of the spindles with the consequent loss in production. Another disadvantage possessedby the usual artificial silk doublers consists in the fact that the threads break very easily when the frame is started, since the yarn is not under tension at this moment.

A still further disadvantage consists in the change of tension that the yarn undergoes during winding from the base to the top of the cop when the latter is of considerable length. "*hese changes in tension produce phenomena of an elastic nature in the yarn'which are such as to prevent its use upon the loonf on account of the fact that the resulting defects are visible upon the fabric.

Now the object of the present invention is to remove all these disadvantages.

With this object in view the subject of the invention is a continuous ring doubling frame for artificial silk capable of giving the initial twist to the fibres starting from the spinning cop in order to obtain either weft cops or spools, or

large bobbins for revolving on braiders, hosiery machines, reels and the like, the said doubling frame comprising a number of improvements which form the subject of the invention.

According to the present invention the drive with a speed reduction from the main tin' roller shaft to the delivery members is effected by means of grooved pulleys and wedge-shaped or trapezoidal belts.

With a view to avoiding the breaking of the threads when the machine is started, temporary disengaging means are provided upon the trans- 05. mission which controls the delivery so that the latter will only be engaged after the spindles, in turning, have imparted a suflicient tension to the threads.

Further, with a view to avoiding any change in tension in the yarn the latter, before reaching the traveller of the ring, passes through a thread guide rigid with the ring rail and consequently moving with the latter.

Finally, in order to facilitate the doubling or 75, in order to satisfy certain requirements of the subsequent treatment means may be provided for moistening the thread with special liquids or emulsions.

One embodiment of the subject of the invention is illustrated diagrammatically and simply by way of example in the accompanying drawing, in which:

Figure 1 shows a front view of the headstock of the machine,

Figure 2 is a longitudinal vertical section taken along the line 211-232 in Figure 1,

Figure 3 is a cross-section showing the arrangement of the delivery rollers and the ring rail,

Figure 4 is a similar view to Figure 3 and shows a modification.

In the drawing (Figures 1 and 2) a is the head stock of the doubling frame and bare spindles driven in the known manner by the drums c. 95

According to the invention a stepped pulley 2 having grooves for a wedge-shaped or trapezoidal belt is mounted upon the shaft 1 of one of the tin rollers c and driven by any motor through a belt passing over the pulley 1 keyed I00 upon the shaft 1. r

This pulley 2 is preferably loosely mounted upon the shaft 1, while means are provided for making it rotate rigidly with the shaft 1 as desired. These means may be formed for example 105 by a friction clutch of any known type adapted to be operated by the control lever 3. In the example-shown in the drawing this friction clutch is formed by the disk 4 slidably mounted upon the shaft 1 but rotating rigidly with the latter. no

controlled by the lever 3, is compelled by the abutment members 6 to adhere to the back part of the pulley 2, thus making it rigid with the shaft 1.

From the pulley 2 the movement is transmitted by the belt 7 to another stepped pulley 8 mounted so as to turn upon the shaft 9 together with the two grooved pulleys 10,. 10' rigid with the pulley 8. From the pulleys 10, 10' the movement is transmitted by the belts 11, 11' to the grooved pulleys 12, 12', rigid with the shafts 13, 13' from which the movement is transmitted, for example, by means of gears 14, 14', to the longitudinal delivery rollers 15, 15' respectively.

By the use of transmission means employing pulleys grooved to take wedge-shaped belts as described above it is possible toobtain speeds of the delivery members which would otherwise be impossible.

The variation in speed, in accordance with requirements, for the purpose of obtaining difl'erent twists is obtained by displacing the belt 7 in the various grooves 'of the two stepped pulleys 2, 8 while on account of the use of a wedgeshaped belt any slip is practically avoided. A constant transmission ratio is consequently maintained as though a gearing transmission had been employed.

Further, on account of the use of the friction clutch 4 in the transmission, it is possible first of all to start the spindles and then, after the latter in turning have sufliciently tensioned the threads, to bring the delivery into action by operating the lever 3. In this way the machine is brought into the working state without any threads being broken.

On account of the use of the belt transmission device the machine is very silent in operation, the consumption of power is low, the machine is cheaper to construct and its maintenance is simployed on a loom.

In order to obviate this disadvantage use is made of the device shown in Figure 3 wherein the yarn d leaving the delivery device formed by the two rollers 15., 15a and'by the top roller 16, instead of proceeding to the spindle and the corresponding bobbin b by passing through a thread guide placed in'a fixed position, is guided through a thread guide 17 rigid with the ring rail 18 carrying the rings 19. This thread guide 1'7 is supported for example by a rod 20 rigid with the ring rail 18. On account of this arrangement the length of the portion of yarn between the thread guide 17 and the traveller 21 moving along the ring 21 remains constant and consequently the angle of swing of the yarn produced by centrifugal tome remains constant.

This disk 4, upon the displacement of a collar 5 Thus any variation in the angle of swing is prevented and this eliminates the first cause of variation in tension in the yarn.

In order to facilitate the doubling operation or the subsequent weaving operations it is sometimes necessary to humidify the yarn with special liquids or emulsions. For this purpose a device has been provided for moistening the yarn before twisting. This device (Figure 3) is formed by a humidifying roller 22 over which the yarn d issuing from the delivery roller 15, 15a passes before winding over the bobbin b. The roller 22 turns at a preestablished speed and is kept at a constant degree of humidity by a wick 23 which dips into the liquid contained in the longitudinal tube 24 and kept at a constant level by any means. This wick is pressed against the cylinder 22 by the bar 25.

The device described above for humidifying the yarn d may also be arranged as shown in Figure 4; that is to say, it may be mounted independently of the device which keeps the tension of the yarn constant as shown in Figure 3.

It is obvious that. the present invention is not limited in any way to the precise arrangements described and illustrated, but that without going outside its scope any modifications may be made which circumstances or the requirements of practice may cause to be considered necessary or advantageous.

What I claim is:--

1. A continuous ring doubling frame for artificial silk for the production of doubled cops or bobbins of any dimensions directly from the spinning cop, including a main rotatable shaft, tin rollers, one of which is carried by the shaft,

delivery members, and a transmission device between the main shaft and delivery members for controlling and obtaining the required high delivery speeds comprising a stepped roller loose on the main shaft, a second stepped pulley, a belt operating over said pulley for the purpose of varying the transmission ratio and consequently the twist, motion transmitting means between the second stepped pulley and the driving members, and a friction clutch device associated with the first stepped pulle'y for the purpose of engaging the delivery at the desired moment in order to avoid breaking the threads when the machine is started.

2. A continuous ring doubler according to claim 1, characterized by the feature that the thread proceeding to the bobbin is guided by a thread guide (1'7) rigid with the ring rail (18) for the purpose of keeping thetension in thread constant during winding.

3. A continuous ring doubler according to claim 1, characterized by means for maintaining a constant humidity in the thread, comprising a rotatable cylinder (22) over which the thread passes upon issuing from the delivery rollers, the cylinder (22) being maintained at a constant degree of humidity by means of a wick 23 dipping into a liquid maintained at a constant level in a tube 24 arranged longitudinally along the machine.

CARLO SCI-ILEIFER. 

